CN113073627A - Large-thickness collapsible loess foundation reinforcing structure - Google Patents
Large-thickness collapsible loess foundation reinforcing structure Download PDFInfo
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- CN113073627A CN113073627A CN202110397404.9A CN202110397404A CN113073627A CN 113073627 A CN113073627 A CN 113073627A CN 202110397404 A CN202110397404 A CN 202110397404A CN 113073627 A CN113073627 A CN 113073627A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a large-thickness collapsible loess foundation reinforcing structure, which comprises a main supporting upright post, a bottom part flow grouting component, a supporting anchor, a side trimming net distributing device and an inner supporting protection component, wherein the lower end surface of the main supporting upright post is fixed with the supporting anchor, the supporting anchor is vertically embedded into an inner sinking groove, and the bottom part flow grouting component is coaxially arranged at the lower side of a lever arm of the main supporting upright post; the upper end face of the main supporting upright post is detachably provided with a side trimming net distributing device, and the side trimming net distributing device carries out surface trimming on the inner edge side wall of the invagination slot position and is encircled by a plurality of layers of fastening net pieces; the main support upright post is further provided with an inner support protection component in a sleeved mode.
Description
Technical Field
The invention relates to the technical field of civil engineering equipment, in particular to a large-thickness collapsible loess foundation reinforcing structure.
Background
In the construction process of northwest and north China, the problem of treatment of large-thickness collapsible loess foundation is often encountered; in order to eliminate the damage of the collapsible loess to the engineering, the compaction pile becomes a method for treating the collapsible loess foundation. The method is characterized in that pile holes are formed in soil by using methods of driving a steel sleeve, vibrating a sinking pipe and the like, then lime soil, cement soil or plain soil is backfilled in the holes in a layered mode and tamped, but the method takes the long engineering line and the large floor area into consideration, so that the large-area foundation treatment is carried out by using lime soil piles, the manufacturing cost is higher, the pile diameter of a lower soil layer is smaller than that of an upper soil layer under the same pile spacing, and the upper soil layer and the lower soil layer are economically reasonable due to the fact that different pile diameters are adopted, so that a large-thickness collapsible loess foundation reinforcing structure is needed to be provided to solve the problems.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a large-thickness collapsible loess foundation reinforcing structure comprises a main supporting upright post, a bottom partial flow grouting component, supporting anchors, a side trimming net distributing device and an inner supporting and protecting component, wherein a plurality of inner sinking grooves for inserting the main supporting upright post are dug in the mud surface layer of large-thickness collapsible loess at intervals, the inner sinking grooves are arranged in a net-shaped staggered manner, the supporting anchors are fixed on the lower end surface of the main supporting upright post and are vertically embedded into the inner sinking grooves by the supporting anchors, and the bottom partial flow grouting component is coaxially arranged on the lower side of a lever arm of the main supporting upright post;
the bottom partial flow grouting assembly is used for grouting and curing through the bottom of the sunken slot position in the internal branch after the main support upright post completes the positioning of the reinforced foundation pit;
the upper end face of the main supporting upright post is detachably provided with a side trimming net distributing device, and the side trimming net distributing device carries out surface trimming on the inner edge side wall of the invagination slot position and is encircled by a plurality of layers of fastening net pieces;
still cup joint on the main tributary props the stand and be provided with the internal stay and protect the subassembly, the internal stay protects the subassembly and finishes the cloth net device in the side and accomplish the cloth net work back and expand to prop the reinforcement to the trench circumference lateral wall that caves in for near regional collapsible loess inside of trench that caves in is tight real state.
As a preferred technical scheme of the invention, the side finishing cloth net device comprises a fixed disc part, an outer rotating seat, a connecting bottom part, a fixed support rod, an adjustable knife rest and a rolling shaft, wherein the main support upright post is sleeved with the fixed disc part in a relatively sliding manner, and the outer rotating seat is arranged outside the fixed disc part in a relatively rotating manner through a built-in rotor;
a connecting bottom piece is rotatably arranged on the main supporting upright post, fixing support rods are symmetrically and vertically connected between the connecting bottom piece and the outer rotating seat, an external motor is arranged on the fixing disc piece, and the output end of the external motor is connected with the outer rotating seat for transmission through the gear meshing effect and drives the outer rotating seat to do unidirectional circular rotation motion;
an adjustable tool rest is vertically arranged on one of the fixed support rods, and the adjustable tool rest adjusts the scraping amplitude of a tool face of the adjustable tool rest through the local torsion deviation effect of the adjustable tool rest;
and a coiling shaft is coaxially arranged on the other fixing support rod and can rotate relatively, and a plurality of layers of fastening net pieces are coiled on the coiling shaft.
As a preferred technical scheme of the present invention, the inner support protection assembly comprises sliding guide shafts, fixed support members, an outer support frame body and a limit screw disc, wherein two sliding guide shafts are coaxially and vertically distributed on the main support upright post in a manner of being capable of relatively sliding, one sliding guide shaft positioned at the lower side is fixedly connected with the main support upright post, and a plurality of fixed support members are circumferentially and symmetrically hinged between the sliding guide shafts;
the upper part and the lower part of the fixing support part are hinged with each other in an X shape relative to the fixing support part, and one end of the fixing support part can be connected with the outer support frame body in a relatively limited sliding manner;
but through the spacing spiral shell dish that is provided with of thread engagement drive effect relative slip on the main support post, the lower extreme of spacing spiral shell dish with the contact is leaned on in the counterbalance of slip guide shaft, works as spacing spiral shell dish is followed when the main support post slides downwards, the slip guide shaft passes through the fixed stay piece and expands the support body of outer support in the indent trench.
As a preferred technical scheme of the invention, the cross section of the peripheral side wall of the outer support frame body is of an arc-shaped structure, and the arc surface of the upper side of the outer support frame body is larger than that of the lower side of the outer support frame body.
As a preferable technical scheme of the invention, a plurality of fastening pieces are arranged on the peripheral side wall of the outer support frame body in an up-down parallel manner, and each fastening piece is inserted on the fastening net piece in a sliding manner and extends into the inner edge side wall of the invagination groove.
As a preferable technical scheme of the invention, a linkage rib rod is also fixed between the adjacent main supporting upright columns.
As a preferred technical solution of the present invention, the bottom partial flow grouting assembly includes an upper seal end piece, a drainage disc body, a support base, and an internal adapting sphere, wherein the support base is fixed on the main support column, the upper seal end piece is mounted on the support base through a locking bolt, and the drainage disc body is disposed in the upper seal end piece;
a plurality of inner adapter spheres are circumferentially arranged between the upper seal end piece and the drainage disc body, so that the drainage disc body is rotationally connected with the upper seal end piece under the rotary driving action of the main support upright post;
a plurality of drainage ports are formed in the upper seal end piece in the circumferential direction, an inner drainage branch and an outer drainage branch are correspondingly arranged on the drainage disc body, and each drainage branch is communicated with the drainage port in an interactive mode through a local deflection effect;
and an inner drainage ring layer and an outer drainage ring layer are arranged at corresponding positions of the supporting base.
As a preferred technical solution of the present invention, an isolation collar is disposed between two drainage ring layers of the supporting base.
Compared with the prior art, the invention provides a large-thickness collapsible loess foundation reinforcing structure, which has the following beneficial effects:
according to the invention, a plurality of invagination slots are dug in the mud surface layer of the large-thickness collapsible loess at intervals, a main supporting upright post is fixedly arranged in each invagination slot, the main supporting upright post is taken as a supporting and reinforcing axis, and an inner supporting and protecting component is used for carrying out expanding supporting on the invagination slots so as to enhance the internal compactness of the large-thickness collapsible loess in the circumferential area range of the invagination slots; before the expanding support, the inner edge side wall of the invagination slot position is subjected to surface finishing by using a side finishing net distributing device, and is encircled with a plurality of layers of fastening net pieces so as to form integration by grouting reinforcement in the later period; the bottom partial flow grouting component is further mounted on the main supporting upright post, particularly, for the reinforcing axle center of the device, in order to prevent the main supporting upright post from deviating under the long-term action, grouting materials with different molding hardness are respectively injected into the bottom end of the main supporting upright post through the bottom partial flow grouting component, and the economic practicality can be considered while the axle center is ensured to be firm.
Drawings
FIG. 1 is a schematic illustration of the zone distribution of the present invention;
FIG. 2 is a first schematic structural diagram of the present invention;
FIG. 3 is a second schematic structural view of the present invention;
FIG. 4 is a schematic structural view of a side finishing web laying apparatus according to the present invention;
FIG. 5 is a schematic structural view of the inner supporting and protecting assembly of the present invention;
FIG. 6 is a schematic structural view of a bottom partial flow grouting assembly of the present invention;
in the figure: the device comprises a 1-side trimming net distributing device, a 101 fixed disc, a 102 external rotating seat, a 103 connecting bottom piece, a 104 fixed supporting rod, a 105 adjustable tool rest, a 106 winding shaft, a 2 main supporting upright post, a 3 bottom partial flow grouting component, a 301 upper sealing end piece, a 302 supporting base, a 303 drainage disc body, a 304 internal adapting ball body, a 305 isolating ring sleeve, a 4 supporting anchor, a 5 internal supporting component, a 501 sliding guide shaft, a 502 fixed supporting piece, a 503 external supporting frame body, a 504 limit screw disc and a 505 linkage reinforcing rod.
Detailed Description
Referring to fig. 1, 2 and 3, the present invention provides a technical solution: a large-thickness collapsible loess foundation reinforcing structure comprises a main supporting upright post 2, a bottom partial flow grouting component 3, supporting anchors 4, a side trimming net distributing device 1 and an inner supporting protection component 5, wherein a plurality of inner sinking grooves for inserting the main supporting upright post 2 are dug in the mud surface layer of large-thickness collapsible loess at intervals, the inner sinking grooves are arranged in a net-shaped staggered manner, the supporting anchors 5 are fixed on the lower end surface of the main supporting upright post 2 and are vertically embedded in the inner sinking grooves by the supporting anchors 5, and the bottom partial flow grouting component 3 is coaxially arranged on the lower side of a lever arm of the main supporting upright post 2;
the bottom partial flow grouting component 3 is used for grouting and curing through the bottom of the sunken slot position of the internal branch path after the main support upright post 2 completes the positioning of the reinforced foundation pit;
the upper end face of the main supporting upright post 2 is detachably provided with a side trimming net distributing device 1, the side trimming net distributing device 1 carries out surface trimming on the side wall of the inner edge of the sunken slot position and is encircled with a plurality of layers of fastening net pieces;
main tributary props and still cup joints on the stand 2 and is provided with internal stay and protects subassembly 5, internal stay protects subassembly 5 and maintains 1 completion cloth net work back of cloth net device in the side and expand to prop the reinforcement to sunken trench circumference lateral wall for near regional collapsible loess inside in sunken trench is tight real state, in this, under the general condition, can install the reinforcing apparatus who is used for consolidating big thickness collapsible loess between interval 3m-5m, especially in building engineering, the ground fastness is great to the building body influence, sunken trench through digging establish a plurality of netted crisscross arrangements is used for consolidating loess mud surface course, with the inside tight real firm effect of guarantee ground.
Referring to fig. 4, in this embodiment, the side finishing cloth net device 1 includes a fixed disk 101, an outer rotating base 102, a connecting bottom piece 103, a fixed support rod 104, an adjustable knife rest 105, and a winding shaft 106, wherein the fixed disk 101 is sleeved on the main support column 2 in a relatively slidable manner, and the outer rotating base 102 is rotatably provided outside the fixed disk 101 through a built-in rotor;
a connecting bottom piece 103 is rotatably arranged on the main supporting upright post 2, fixing support rods 104 are symmetrically and vertically connected between the connecting bottom piece 130 and the outer rotating seat 102, an external motor (not shown in the figure) is arranged on the fixing disc piece 101, and the output end of the external motor is connected with the outer rotating seat 102 for transmission through a gear meshing effect and drives the outer rotating seat 102 to do unidirectional circular rotation motion;
an adjustable tool rest 105 is vertically arranged on one of the fixed supporting rods 104, and the adjustable tool rest 105 adjusts the scraping and cutting amplitude of the tool face of the adjustable tool rest through the local torsion deviation effect of the adjustable tool rest 105;
the other fixing support rod 104 is coaxially provided with a rolling shaft 106 capable of rotating relatively, and the rolling shaft 106 is wrapped with a plurality of layers of fastening net pieces, so that the labor intensity of post-finishing of the artificial digging surface is reduced, the engineering quality is ensured, and meanwhile, the post-grouting integrated forming can be facilitated.
Referring to fig. 5, in this embodiment, the inner supporting and protecting assembly 5 includes a sliding guide shaft 501, a fixed supporting member 502, an outer supporting frame body 503 and a limiting screw disk 504, wherein two sliding guide shafts 501 are coaxially and vertically distributed on the main supporting upright 2 and can slide relatively, one sliding guide shaft 501 located at the lower side is connected and fixed with the main supporting upright 2, and a plurality of fixed supporting members 502 are circumferentially and symmetrically hinged between the sliding guide shafts 501;
the upper and lower parts of the fixed support member 502 are hinged with each other in an X shape, and one end of the fixed support member 502 can be connected with the outer support frame body 503 in a relatively limited sliding manner;
but main tributary props up 2 and goes up being provided with spacing swivel nut 504 through thread engagement drive effect relative slip, the lower extreme of spacing swivel nut 504 with the contact is leaned on in the counterbalance of slip guide shaft 501, works as spacing swivel nut 504 is followed when main tributary props up stand 2 and slides downwards, slip guide shaft 501 will prop outward the support body 503 through fixed support piece and expand in the trench that caves in, in this, can prop the guide effect through fixed support piece outward and carry out local adjustment to the external diameter that expands of propping the support body outward to carry out inside to prop it and protect when adapting to the trench size that caves in.
In this embodiment, the cross section of the peripheral side wall of the outer support body 503 is an arc-shaped structure, and the arc surface on the upper side is larger than the lower side, so that arc expansion adjustment can be effectively performed according to the difference between the collapse coefficient of the lower soil layer and the collapse coefficient of the upper soil layer within the range of the compaction depth, and the strengthening and compacting effects are ensured.
In this embodiment, a plurality of fastening members are arranged in parallel up and down on the peripheral side wall of the external support frame 503, and each fastening member is slidably inserted into the fastening net member and extends into the inner edge side wall of the invagination groove.
In this embodiment, a linking bar 505 is further fixed between the adjacent main supporting columns 2, so that the main supporting columns form a reinforced whole, and the fastening effect is further improved.
Referring to fig. 6, in the present embodiment, the bottom partial flow grouting assembly 3 includes an upper seal end piece 301, a drainage disc 303, a support base 302, and an inner adapter sphere 304, wherein the support base 302 is fixed on the main support column 2, the upper seal end piece 301 is mounted on the support base 302 through a locking bolt, and the drainage disc 303 is disposed in the upper seal end piece 301;
a plurality of inner adapter spheres 304 are circumferentially arranged between the upper seal end piece 301 and the drainage disc 303, so that the drainage disc 403 is rotationally connected to the upper seal end piece 301 by the rotational driving action of the main support column 2;
a plurality of drainage ports are formed in the upper seal end piece 301 in the circumferential direction, an inner drainage branch and an outer drainage branch are correspondingly arranged on the drainage disc body 303, and each drainage branch is communicated with the drainage port in an interactive mode through a local deflection effect;
the corresponding position of the supporting base 302 is provided with an inner drainage ring layer and an outer drainage ring layer.
In this embodiment, an isolation ring 305 is installed between two drainage ring layers of the supporting base 302, and in consideration of engineering cost, most of building foundations are reinforced by injecting high-quality slurry into the inner ring layer of the supporting base and injecting general slurry into the outer ring layer of the supporting base to achieve the same grouting effect and reduce cost.
Specifically, in carrying out the ground reinforcement to big thickness collapsible loess, excavate the ensconced trench that a plurality of netlike crisscross arranged on this collapsible loess mud surface course, with main tributary strut stand through fixed anchor inserts wherein, shunt the slip casting to the ensconced trench bottom by the partial flow slip casting subassembly of bottom, guarantee main tributary strut stand axle center and strut the fastness, carry out the surfacing to the interior edge lateral wall of ensconced trench through the side is maintained the cloth net device, enclose and cover multilayer fastening net spare, protect the subassembly by the internal stay and adjust the expansion according to the size of ensconced trench internal diameter, carry out the slip casting to each ensconced trench at last, accomplish the reinforcing effect, can install linkage muscle pole between adjacent main tributary strut stand simultaneously, thereby form and consolidate wholly.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the technical scope of the present invention, and the technical solution and the inventive concept thereof should be covered by the scope of the present invention.
Claims (8)
1. The utility model provides a big thickness collapsible loess foundation reinforced structure, its includes main support post (2), bottom fractional flow slip casting subassembly (3), supports anchor (4), side and repaiies cloth net device (1) and internal stay and protects subassembly (5), wherein, the mud surface course that is located big thickness collapsible loess is separated to dig and is equipped with a plurality ofly and is used for placeeing the invagination trench of main support post (2), it is a plurality of the invagination trench is netted crisscross the arranging, the lower terminal surface of main support post (2) is fixed with and supports anchor (5), and by support anchor (5) vertical embedding setting in the invagination trench, its characterized in that: a bottom partial flow grouting assembly (3) is coaxially arranged on the lower side of a lever arm of the main supporting upright post (2);
the bottom partial flow grouting component (3) is used for grouting and curing through the bottom of the sunken slot position in the internal branch of the main support upright post (2) after the main support upright post (2) completes the positioning of the reinforced foundation pit;
the upper end face of the main supporting upright post (2) is detachably provided with a side trimming net distributing device (1), the side trimming net distributing device (1) carries out surface trimming on the side wall of the inner edge of the inner sunken groove and covers a plurality of layers of fastening net pieces in a surrounding mode;
still cup joint on main support post (2) and be provided with interior supporting and protect subassembly (5), interior supporting protects subassembly (5) and accomplishes cloth net work back to sunken trench circumference lateral wall and expand to prop the reinforcement in side trimming cloth net device (1) for near regional collapsible loess inside of sunken trench is compact state.
2. The large-thickness collapsible loess foundation reinforcing structure according to claim 1, wherein: the side finishing netting device (1) comprises a fixed disc piece (101), an outer rotating seat (102), a connecting bottom piece (103), a fixed support rod (104), an adjustable tool rest (105) and a rolling shaft (106), wherein the fixed disc piece (101) is sleeved on the main supporting upright post (2) in a relatively sliding mode, and the outer rotating seat (102) is arranged outside the fixed disc piece (101) in a relatively rotating mode through a built-in rotor;
a connecting bottom piece (103) is rotatably arranged on the main supporting upright post (2), fixing support rods (104) are symmetrically and vertically connected between the connecting bottom piece (130) and the outer rotating seat (102), an external motor is arranged on the fixing disc piece (101), and the output end of the external motor is connected with the outer rotating seat (102) for transmission through the gear meshing effect and drives the outer rotating seat (102) to do unidirectional circular rotating motion;
an adjustable tool rest (105) is vertically arranged on one of the fixed supporting rods (104), and the adjustable tool rest (105) adjusts the scraping amplitude of the tool face of the adjustable tool rest through the local torsional deviation action of the adjustable tool rest (105);
and a rolling shaft (106) is coaxially arranged on the other fixing support rod (104) and can rotate relatively, and a plurality of layers of fastening net pieces are wound on the rolling shaft (106).
3. The large-thickness collapsible loess foundation reinforcing structure according to claim 1, wherein: the inner supporting and protecting assembly (5) comprises sliding guide shafts (501), fixed supporting pieces (502), an outer supporting frame body (503) and a limiting screw disc (504), wherein two sliding guide shafts (501) are coaxially distributed on the main supporting upright (2) in a vertical manner and can slide relatively, one sliding guide shaft (501) positioned at the lower side is fixedly connected with the main supporting upright (2), and a plurality of fixed supporting pieces (502) are symmetrically hinged between the sliding guide shafts (501) in the circumferential direction;
the upper part and the lower part of the fixed supporting piece (502) are hinged with each other in an X shape, and one end of the fixed supporting piece (502) can be connected with the outer supporting frame body (503) in a relatively limited sliding way;
but main support post (2) go up through the spacing spiral shell dish (504) that is provided with of thread engagement drive effect relative slip, the lower extreme of spacing spiral shell dish (504) with slide guide shaft (501) are leaned on the contact, work as spacing spiral shell dish (504) are followed when main support post (2) slide downwards, slide guide shaft (501) are through the fixed support piece with outer support frame body (503) expand prop in the indent trench.
4. A large-thickness collapsible loess foundation reinforcing structure according to claim 3, wherein: the cross section of the peripheral side wall of the outer support frame body (503) is of an arc structure, and the arc surface of the upper side of the outer support frame body is larger than the lower side of the outer support frame body.
5. A large-thickness collapsible loess foundation reinforcing structure according to claim 4, wherein: a plurality of fastening pieces are arranged on the peripheral side wall of the outer support frame body (503) in an up-down parallel manner, and each fastening piece is inserted on the fastening net piece in a sliding manner and extends into the inner edge side wall of the invagination groove.
6. A large-thickness collapsible loess foundation reinforcing structure according to claim 5, wherein: and a linkage rib rod (505) is also fixed between the adjacent main supporting columns (2).
7. The large-thickness collapsible loess foundation reinforcing structure according to claim 1, wherein: the bottom partial flow grouting assembly (3) comprises an upper seal end piece (301), a drainage disc body (303), a support base (302) and an inner adapter sphere (304), wherein the support base (302) is fixed on the main support column (2), the upper seal end piece (301) is installed on the support base (302) through a locking bolt, and the drainage disc body (303) is arranged in the upper seal end piece (301);
a plurality of inner adapter spheres (304) are circumferentially arranged between the upper seal end piece (301) and the drainage disc body (303), so that the drainage disc body (403) is rotationally connected with the upper seal end piece (301) by the rotary driving action of the main supporting upright (2);
a plurality of drainage ports are formed in the upper circumference of the upper seal end piece (301), an inner drainage branch and an outer drainage branch are correspondingly arranged on the drainage disc body (303), and each drainage branch is communicated with the drainage port in an interaction manner through a local deflection effect;
and an inner drainage ring layer and an outer drainage ring layer are arranged at corresponding positions of the supporting base (302).
8. A large thickness collapsible loess foundation reinforcing structure according to claim 7, wherein: an isolation ring sleeve (305) is erected between the two drainage ring layers of the supporting base (302).
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| CN202110397404.9A CN113073627B (en) | 2021-04-13 | 2021-04-13 | Large-thickness collapsible loess foundation reinforcing structure |
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| CN202110397404.9A CN113073627B (en) | 2021-04-13 | 2021-04-13 | Large-thickness collapsible loess foundation reinforcing structure |
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| CN114808922A (en) * | 2022-04-19 | 2022-07-29 | 中国建筑第五工程局有限公司 | Complicated foundation slip casting device of building engineering |
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| CN114808922B (en) * | 2022-04-19 | 2024-01-26 | 中国建筑第五工程局有限公司 | Building engineering complex foundation grouting device |
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| CN113073627B (en) | 2022-09-13 |
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